ESD inducing apparatus in mobile communication terminal with fingerprint recognition function

Abstract

The provided is an electrostatic discharging (ESD) inducing apparatus in a mobile communication terminal with a fingerprint recognition function. The ESD inducing apparatus includes: a fingerprint recognizing unit for obtaining fingerprint information by contacting with a fingerprint of a human finger, which is provided to one side of the mobile communication terminal; a printed circuit board provided with a mounting unit contacting with the fingerprint recognizing unit for receiving the fingerprint information from the fingerprint recognizing unit; and a ground unit for inducing a static electricity caused by contacting with the fingerprint, which is provided to the printed circuit board adjacent to the mounting unit.

1. An electrostatic discharge (ESD) inducing apparatus in a mobile communication terminal with a fingerprint recognition function, comprising:
 a fingerprint recognizing device to obtain fingerprint information by contacting with a fingerprint of a human finger, the fingerprint recognizing device being provided on one side of the mobile communication terminal; 
 a printed circuit board provided with a mounting device contacting with the fingerprint recognizing device to receive the fingerprint information from the fingerprint recognizing device, the mounting device comprising a plurality of contact balls on the printed circuit board; and 
 a ground device to induce a static electricity caused by contacting with the fingerprint, the ground device being provided to the printed circuit board adjacent to the mounting device, wherein the ground device comprises a patterned thin film disposed on the printed circuit board, and the patterned thin film includes: 
 an ESD ground pad located proximate to the mounting device of the printed circuit board, and 
 a plurality of protection pads projecting from the ESD ground pad toward the contact balls of the mounting device to induce the ESD from the fingerprint recognizing device to the ground pad, 
 wherein a first protection pad comprises a body portion and an expand portion attached to the body portion, wherein the body portion comprises a proximal end and a distal end, wherein the body portion is tapered along a direction from the proximal end to the distal end, and wherein the expanded portion is attached to the distal end. 
 
     
     
       2. The ESD inducing apparatus as recited in  claim 1 , wherein the ESD ground pad is in a shape of a wide plain. 
     
     
       3. The ESD inducing apparatus as recited in  claim 2 , wherein the expanded portion is circular or polygonal. 
     
     
       4. A fingerprint screening system, comprising:
 a fingerprint sensor having a fingerprint recognition surface to receive a fingerprint and to generate fingerprint information if a finger contacts the fingerprint recognition surface; 
 an electrical contact connected to the fingerprint sensor to provide an electrical connection with a fingerprint information processing circuit, the electrical contact comprising a plurality of contact balls; and 
 an electrostatic discharge bypass comprising a patterned thin film disposed on the fingerprint information processing circuit and located proximate to the electrical contact, wherein the patterned thin film comprises a substantially equipotential pad and a plurality of projecting pads connected to and projecting from the substantially equipotential pad toward the contact balls of the electrical contact, 
 wherein a first protection pad comprises a body portion and an expanded portion attached to the body portion, wherein the body portion comprises a proximal end and a distal end, wherein the body portion is tapered along a direction from the proximal end to the distal end, and wherein the expanded portion is attached to the distal end. 
 
     
     
       5. The system of  claim 4 , wherein the expanded portion is circular or polygonal. 
     
     
       6. The system of  claim 4 , wherein the electrostatic discharge bypass is not physically connected to the electrical contact. 
     
     
       7. The system of  claim 4 , wherein the electrostatic discharge bypass comprises at least one electrostatic discharge current receiver to receive an electrostatic discharge current from the fingerprint sensor via the electrical contact. 
     
     
       8. The system of  claim 7 , wherein the at least one electrostatic discharge current receiver is substantially electrically grounded. 
     
     
       9. The system of  claim 4 , wherein the fingerprint sensor comprises a fingerprint sensor chip having the fingerprint recognition surface integrated thereon. 
     
     
       10. The system of  claim 4 , wherein the system is part of a portable electronic device. 
     
     
       11. The system of  claim 4 , wherein the system is part of a wireless telecommunication device.